JP2003340350A - Resin spray-coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproofing or a pour flooring laying method using a normal temperature-curable resin which does not scatter to the surroundings and shows excellent leveling properties and can be continuously mixed and is free from a mixing failure. <P>SOLUTION: The normal temperature-reaction curable resin adjusted to the gelling time of one to 60 minutes and the respective amounts of a first liquid and a second liquid which chemically reacts with the former are pressure- fed through a hose using a fixed displacement pump. Next, both liquids are mixed by a static mixer at the discharge tip part of the hose and the mixture is spray-coated to the thickness of 0.5 to 5.0 mm under the pressure of 80 kg/cm<SP>2</SP>through a spray nozzle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for waterproofing or coating a floor with a room temperature curable resin that has good leveling properties, does not scatter to the surroundings, and does not cause defective mixing.

[0002]

2. Description of the Related Art Conventionally, a room temperature reactive urethane resin has been favorably used as a coating waterproof material, and it is used for new construction or renovation on a rooftop, veranda, hallway, etc. of a building. It is preferred and used in large quantities as a seamless finishing material in factories, warehouses, hospitals, schools, etc. However, the workability is generally poor because of trowel coating or roller coating, which requires time and labor. The material mixture is
Since batch mixing is performed using a gallon can or the like, unstirred material may remain in the corners and the periphery of the can, resulting in insufficient mixing and poor curing.

In recent years, a method of spray-coating a highly reactive two-component urethane material, momentarily causing a curing reaction, and applying a polyurethane coating waterproof material has also become popular. Such a highly reactive two-component urethane material is a material that cures at a super fast rate of about several seconds from the mixing of the two components to the gelation. for that reason,
The tip of the spray gun called collision mixing has no choice but to take a mixing method for a very short time. Since the gelling time is short and the leveling property of the material is poor, a uniform coating film cannot be obtained unless it is sprayed in the finest possible mist. In this way,
When spray coating, mist scatters to contaminate the surrounding environment, and since the coated surface has no leveling property, there are serious drawbacks such as the coated surface becoming matte.

As described above, the conventional waterproofing or floor coating method using a room temperature curable material has various drawbacks. Therefore, it does not scatter and has a proper curing time to coat the waterproofing or floor coating material. There has been a demand for a spraying method in which the next step of applying a top coat can be performed on the day of work, and furthermore, leveling can be performed to obtain a smooth finish.

[0005]

Under these circumstances, the present invention is a next step within the day of applying waterproofing or floor coating with a suitable curing time without mist scattering. The purpose of the present invention is to provide a construction method capable of applying a top coat and obtaining a smooth finish.

[0006]

The present inventors have conducted extensive studies to achieve the above object, and as a result, have found that the gelation time is 1
The present invention has invented a construction method in which a room temperature reactive resin for not less than 60 minutes and not more than 60 minutes is continuously mixed and sprayed from a nozzle at a low pressure, which is excellent in leveling property without scattering and enables shortening of construction.

That is, a room temperature reaction-curable resin having a gelling time adjusted within a range of 1 minute to 60 minutes, in which a predetermined amount of each of the first liquid and the second liquid which reacts with the first liquid is hose by a metering pump. Then, the mixture is mixed by a static mixer at the discharge end of the hose, and then sprayed to a thickness of 0.5 to 5.0 mm at a pressure of 80 kg / cm ² or less at the nozzle tip through a spraying nozzle.

The first liquid and the second liquid each have a viscosity of 20 ° C.
Is 10,000 CPS or less and is a resin liquid that becomes a rubber-like or hard rubber state by a urethane reaction, or a resin liquid accompanied by an epoxy reaction.

As the metering pump, a pump of a plunger type, a diaphragm type, a gear type or the like which can feed the first liquid and the second liquid at desired ratios is used.

In order to match the viscosities of the first liquid and the second liquid to the pressure feeding device, a heater for heating the liquid is provided between the liquid supply container and the metering pump or between the metering pump and the tip of the hose discharge. It is provided between. The heater is combined with a temperature controller so that the liquid temperature can be adjusted between room temperature and 80 ° C.

Mixing of liquids is continuously carried out by a static mixer attached to the tip of the hose. The static mixer is preferably used with a mixing number of 7 or more. If the number of mixing is small, uneven stirring is likely to occur. Since there is a large number of stages and the pressure loss is large, it does not mean that there is no limit to the number.

The nozzle used for spraying is appropriately selected depending on the discharge viscosity of the material and the coating amount. The spraying pressure is 80 kg / cm ² or less at the nozzle tip.

The coating thickness is 0.5 to 5.0 depending on the application.
mm. In order to secure a desired coating thickness, the spraying can be performed twice or more as needed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Since waterproofing materials and flooring materials are used on site, it is essential that they are room temperature reaction curable resins.
Urethane resin is the preferred material for waterproofing,
The cured product has rubber elasticity and cracks in the concrete
The coating follows the movement of the building without breaking. Hard urethane resins or epoxy resins are preferably used for coated floor applications because both strength and durability such as chemical resistance and abrasion resistance are required.

The gel time of the resin should be at least 1 minute. The momentary reaction cure of less than 1 minute does not level the sprayed material. If it is 60 minutes or more, a waiting time occurs until the work of the next process and the recoating work such as the top coat cannot be done on that day, so that the process cannot be rationalized and shortened.

The pressure feeding is performed by a metering pump. Normally, a plunger type pump is used, but a diaphragm pump or a computer controlled gear pump is also used.
The first liquid and the second liquid are pumped by a metering pump, and the mixing ratio is set so as to match the equivalent ratio of the reaction group to the volume. It can be set by the pump or the material liquid.

The pressure feeding device sets the respective liquids at different temperatures during the pressure feeding when the viscosity of the material is high, such as in winter, according to the viscosity temperature curve of the material, or when the viscosities of the first liquid and the second liquid are different. The 1st liquid and the 2nd liquid can be heated by a heater so as to have the same viscosity.

Since a long pumping hose is used in the field work, a heat retaining heater can be attached to the hose so that the temperature does not drop in the hose.

By heating, a material having a lower viscosity is obtained, the mixing efficiency is improved, and a large amount of the material can be sprayed at a low pressure, so that the working efficiency is improved.

The materials fed under pressure are mixed by a static mixer at the discharge tip of the hose. By heating, the viscosity becomes low, and there is no stirring failure and continuous mixing is performed, so that work efficiency is significantly improved in a large area.

The material is sprayed from the tip by a so-called airless method in which air is not mixed. The spray pressure at the nozzle tip is 80 kg / cm at the nozzle tip.
It is performed at a low pressure of ² or less. 80 in the conventional collision mixing method
Since it is sprayed at 150 kg / cm ² , it is inevitable to generate mist.

The objects to be applied are concrete, mortar,
It is a base used for waterproofing and floor coating applications such as steel plates, synthetic resin plates, heat insulating materials, and panels. The work is performed after applying an appropriate base treatment.

The material viscosity is 10,000 C at 20 ° C.
PS or less is used. When the viscosity is high, the pressure loss in the hose during pumping is large and the desired discharge amount cannot be obtained. Since it is possible to lower the viscosity by heating, if the viscosity and the reactivity at the time of heating are combined, the curing time after spray coating at the time of heating can be easily adjusted.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An explanation will be given based on Examples.

[0025]

[Example 1] A concrete roof slab that was cast and cured for 28 days was used as the construction base. Outside temperature at the time of construction is 12 ℃
Then, on the day before construction, the surface latance was scraped off, and a urethane primer was applied at 200 g / m ² .

The material used was a urethane prepolymer (main material) of 650 CPS at 25 ° C. and a curing agent of 600 CPS (volume ratio 1: 1) UP Quick SL-500 (manufactured by Takeda Chemical Industries) at 20 ° C. as waterproof materials. The material was used by heating the main material to 50 ° C and the curing agent to 45 ° C based on the viscosity temperature curve. The gel time of the mixed material was about 5 minutes at 20 ° C.

A plunger type pump was used to pump the material. The material was passed through a heater of about 4 KW attached to the pump discharge port to raise the temperature, and a heater of about 1.5 KW was attached to the 60 m hose to keep the material warm.

For mixing and spraying, 2 m was obtained by continuously stirring with a 20-stage static mixer attached to the tip of the hose.
Sprayed through an mφ fan-shaped nozzle.

40 kg / cm ^{2 at the} tip of the discharge nozzle
Under the above conditions, 6 liters per minute of each of the main material curing agents was pressure-fed and sprayed onto the surface of the concrete which had been treated with the primer.

Immediately after spraying, the material had a slight unevenness and had a so-called satin finish, but the material leveled and became a mirror surface state in about 3 minutes. After about another 30 minutes the material gelled,
In 90 minutes, the hardness became such that it could walk on the coating film.

Subsequently, UP top 620 was applied as a top coat by a roller at 250 g / m ² .

In this way, about 3
After a certain time, waterproofing was completed and the surface was smooth and mirror-finished.

[0033]

[Example 2] The construction foundation was an indoor concrete floor slab that was set and cured for 21 days. The temperature of the slab surface during construction was 18 ° C. On the day before construction, the surface latance was scraped off, and an epoxy resin primer was applied at 200 g / m ² .

The spraying material is composed of an epoxy resin (main material) of 5000 CPS at 20 ° C. and a curing agent of 1500 CPS (volume ratio 2: 1) at 20 ° C. Tough coat 701 (Alvar Industrial Co., Ltd.) which gels at about 50 minutes at 20 ° C. Was used as a coating floor material. The material was used by heating the main material to 60 ° C and the curing agent to 35 ° C.

A plunger type pump was used for material pressure feeding. The material was passed through a heater of about 4 KW attached to the pump discharge port to raise the temperature, and a heater of about 1.5 KW was attached to the 60 m hose to keep the material warm.

Mixing and spraying were carried out by continuously stirring with a 12-stage static mixer attached to the end of the hose,
It was sprayed through a 2.8 mmφ nozzle.

Pressure at outlet of plunger pump 50 kg
Under the condition of / cm ² , the main material curing agent was pumped at a rate of 5 liters per minute, and sprayed onto the surface of the concrete. No mist was generated at all, and the curing around the baseboard was only slightly soiled.

Immediately after the spraying, as in Example 1, it had a slight unevenness and had a so-called satin finish, but without leveling with a trowel or the like, the material leveled and became a mirror surface state in about 5 minutes.
After about 60 minutes, the material gelled, and the hardness reached 240 minutes so that it could walk on the coating film.

In this way, after the construction of the coated flooring material is started, 4
After a while, the construction was completed and the surface was smooth and mirror-finished.

[0040]

EFFECTS OF THE INVENTION According to the coating method of the present invention, continuous mixing by a static mixer and low-pressure airless spraying do not cause mist scattering at all, and leveling time can be taken before gelation, so that the conventional matte finish is achieved. A smooth finished surface can be obtained without any deterioration, and a waterproof coating film or a coated floor material having excellent finish can be efficiently applied.

Further, unlike the conventional trowel coating, it is not necessary to bend over and the work is reduced, and if the material is supplied in a large container such as a drum can, the container can be reused and industrial waste is greatly expanded. It can be reduced and the contribution to industry is great.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiro Shiotani             3-20 Murakuni-cho, Takefu City, Fukui Prefecture 2 (72) Inventor Hideyasu Hagiwara             5-9 Hiraicho, Sabae City, Fukui Prefecture F-term (reference) 4D075 AA01 AA84 AA86 BB16X                       BB22Y BB92Z BB95Z BB96Z                       CA38 DA06 DA23 DC01 DC05                       EA07 EA23 EA27 EB33 EB38

Claims (3)

[Claims] 1. A room temperature reaction curable resin having a gelling time adjusted to 1 minute or more and 60 minutes or less, wherein a predetermined amount of a first liquid and a second liquid which reacts with the first liquid are respectively supplied by a metering pump. And then mixed with a static mixer at the hose discharge tip and then spray-coated to a thickness of 0.5 to 5.0 mm at a pressure of 80 kg / cm ² or less at the nozzle tip through a spray nozzle. Coating method. 2. The first liquid and the second liquid each have a viscosity of 10000 CPS or less at 20 ° C., and are resin liquids which become rubbery or hard rubber-like by a urethane reaction or resin liquids accompanied by an epoxy reaction. The coating method according to claim 1 3. A heater for heating the first liquid and the second liquid is provided between the liquid supply container and the metering pump, or between the metering pump and the hose discharge tip, and the heater is used. The coating method according to claim 1, wherein the resin liquid is heated before use.